Quantum dynamics in non-Hermitian systems are believed to be quite different from the standard Hermitian systems. Quantum walk originated from a generalization of the classical random walk has also been extended to non-Hermitian systems [1]}. A quantum walker will completely leak out eventually from a bipartite lossy lattice with uniform loss rates [2]}. The quantum walker in this system is expected to escape predominantly from nearby sites of a starting point that is far from the edges. However, numerical computations show that the decay probability distribution is left-right asymmetric, and a relatively large peak in the loss probability at the farthest edge from the staring point occurs. More unexpectedly, the relative height of this peak grows with the distance between the starting point and the edge. Originally, it was attributed to topological edge states [2]}, which is questioned in a recent paper [4]}. The appearance of an edge peak (so-called the edge burst) was demonstrated to stem entirely from the interplay between two prominent non-Hermitian phenomena, NHSE and
imaginary gap closing [4]}. The left-right asymmetry is attributed to the NHSE since all eigenstates are localized at one edge of the system, and the large peak at the edge is due to the imaginary gap closing.
